Hydraulic System, Bleeding With Brake Charger/Bleeding Unit

WARNING: This page is about a different car, the 2022 Audi S3, 2022 Audi RS 3, 2022 Audi A3 Quattro, and 2022 Audi A3. However, it is still accessible from the selected car via links, so may be relevant.

The brake system is divided diagonally.

The bleeding of the hydraulic system using the Brake Charger/Bleeder Unit :VAS5234 is described.
An initial pressure of 2 bar is required to bleed the ABS Hydraulic Unit -N55-.

Special tools and workshop equipment required

Brake Charger/Bleeder Unit :VAS5234 with Brake Bleeder Adapter :VAS5234/1A
Wrench - Brake Bleeder Set :VAS5519
Brake Bleeding Tool Set :VAS6564

Procedure

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-- Fill the brake fluid reservoir with brake fluid up to the "MAX" mark.

-- Connect the :VAS5234 with Brake Bleeder :VAS5234/1A (example photo).

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-- Set the correct pressure on the Brake Charger/Bleeder Unit. Refer to the Operating instructions from the :VAS5234 .

TIP:

For certain tire combinations the removal of the wheels is required.

-- Remove the protective cap from the bleed screw on the brake caliper.

Use a suitable bleeder hose. It must be seated tightly on the bleed screw so that no air can enter the brake system.
Pay attention to the operation manual for :VAS6860 !

-- Connect the hose -1- on the container.

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Bleeding Sequence

1 -

Left Front Brake Caliper

2 -

Right Front Brake Caliper

3 -

Left Rear Brake Caliper

4 -

Right Rear Brake Caliper

Bleed the brake caliper at each bleed screw. If the brake caliper has two bleed screws, bleed the outer screw first.

-- With the brake caliper bleed screw attached, leave the brake caliper bleeder valve open long enough so that the brake fluid flows out free of bubbles.

-- Tighten the bleed screw, remove the bleeder hose and place the protective cap on the bleed screw.

-- Repeat the bleeding procedure in the specified sequence for the remaining brake calipers.

-- Start the engine and check the brake pedal travel and pressure.

-- If the pedal travel is too long, check the brake system for leaks or repeat the bleeding procedure.

-- Fill the brake fluid reservoir up to the "MAX" mark and screw on the cap.

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A road test must be performed after bleeding. During this, at least one ABS control must be performed!

Changing the brake fluid

Refer to BRAKE FLUID, CHANGING

CAUTION:

Faulty brakes increase the risk of an accident.

- Make sure the brakes are working correctly before driving the vehicle for the first time.

Tightening Specifications

Refer to OVERVIEW - FRONT BRAKES
Refer to OVERVIEW - REAR BRAKES